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Poster Info

Posts: 20,040
Registered: January 2010
Location: Saskatchewan, Canada


HM Digital DM-1: In-Line Dual TDS Monitor
Reviews Views Date of last review
1 8011 Sat March 10, 2012
Recommended By Average Price Average Rating
100% of reviewers None indicated 9.0


•Displays TDS levels of the feed water and product water with in & out electrode probes.
•Highly efficient and accurate due to its advanced microprocessor technology.
•Auto-Off function conserves battery power. The unit shuts off automatically after 10 minutes of non-use.
•Dual Range 0-9990 ppm (From 0 - 999 ppm the resolution is 1 ppm. From 1000 to 9990 ppm, the resolution is 10 ppm, indicated by a blinking 'x10' image.)
•Factory Calibrated: our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver.
•Comes equipped with Mur-lok® Quick-Connect T-fittings.
•Installs quickly and easy

Range: 0-9990 ppm
Accuracy: ±2%
Conversion Factor: NaCl (avg. 0.5)
Cable Length: 24.5" (including sensor)
Fittings: 1/4" standard, also available with 3/8" or 1/2"
Power source: 2 x 1.5V button cell batteries (included)
Battery life: approx. 1000 hours of continuous use
Size: 7.6 x 2 x 4.7 cm (3 x .8 x 1.9 in.)
Weight: 79.4 g (2.8 oz.)

(info taken directly from the company’s web site www.
Keywords: TDS tester

p_21212_28576P.jpg p-74850-57358-59-fish-supplies.jpg




Registered: January 2010
Location: Saskatchewan, Canada
Posts: 20040
Review Date: Sat March 10, 2012 Would you recommend the product? Yes | Price you paid?: None indicated | Rating: 9 

Positive aspects of the product (pros): Very accurate
Cons: cost

I’ve been using this in-line tester on my RO/DI unit for a few weeks now. I have found to be very very accurate and easy to use as I have mounted it directly to the RO/DI unit its self. I have had the readings double checked at a SW LFS with there almost lab quality tester a few times now and the reading have been confirmed as accurate each and every time.

If you take your time to do the research FIRST, you can successfully set-up and keep ANY type of aquarium with ease.
"Not using a quarantine tank is like playing Russian roulette. Nobody wins the game, some people just get to play longer than others." - Anthony Calfo
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